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Diabetes Care, Vol 23, Issue 3 335-338, Copyright © 2000 by American Diabetes Association
Metabolic and immunologic features of Chinese patients with atypical diabetes mellitus
KC Tan, IR Mackay, PZ Zimmet, BR Hawkins and KS Lam
Department of Medicine, Queen Mary Hospital, Hong Kong, China.
OBJECTIVE: To determine whether atypical diabetes mellitus (ADM) is present
in the Chinese population in Hong Kong. RESEARCH DESIGN AND METHODS: The
records of Chinese patients who attended the Diabetes Clinic at Queen Mary
Hospital were reviewed. We identified 11 patients who initially presented
with acute diabetic ketoacidosis but subsequently displayed clinical
features more typical of type 2 diabetes. Metabolic studies and HLA typing
were performed to characterize this group of Chinese patients with ADM.
RESULTS: C-peptide response of the patients with ADM 1 h after a standard
meal was intermediate between that of type 1 diabetic patients (matched for
age and duration of diabetes) and that of nondiabetic control subjects
(matched for age and BMI) (analysis of variance, P = 0.02). Insulin
sensitivity measured by a short insulin tolerance test was not
significantly different between patients with ADM and their matched
nondiabetic control subjects. HLA typing showed that none of the patients
with ADM had the DR3 allele and that the frequency of DR9 was not
increased. Only one patient had significantly increased levels of
antibodies to GAD and islet cell antigen 512. CONCLUSIONS: ADM, which was
first described in African-Americans, is seen also in Chinese subjects.
These patients have significant residual C-peptide secretory capacity and
should not be misdiagnosed and treated as patients with type 1 diabetes
with life-long insulin therapy.

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Copyright © 2000 by the American Diabetes Association.
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